Just rebuild a set of Cub hubs. So have it fairly fresh in mind, but to avoid posting anything wrong had a look in the "Triumph Tiger Cub Bible" as well and apparently that books contains all the wisdom! If only I used it instead of dragging rusty greasy worn bearings around.
Front:
-Left side: type 6202 - 15mm ID x 35mm OD x 11 mm wide
-Right side: type 6203 - 17mm ID x 40mm OD x 12 mm wide
Rear:
Both the same size: type 6203 - 17mm ID x 40mm OD x 12 mm wide.
I went for the sealed ones and since I only plan on using the bike for trials (No greenlaning, so speeds will stay low), I went for budget series, but Stainless steel sealed bearings. Think is going to pay of when using the bike for wading and muddy trials.
Good luck with the rebuild!